Proceedings of the International Conference on Electromagnetic Interference and Compatibility (IEEE Cat. No.02TH8620)最新文献

{"title":"Studies on new and highly tapered amplitude distribution for low EMI applications","authors":"N. B. Subrahmanyam, G. Raju, K. Gottumukkala, H. Khan","doi":"10.1109/ICEMIC.2002.1006537","DOIUrl":"https://doi.org/10.1109/ICEMIC.2002.1006537","url":null,"abstract":"It is evident from literature that no amplitude distribution is optimal in the generation of narrow beams. This is due to the opposite behaviour of side lobe levels and beam width. In view of this some studies are made to propose a few tapered distributions, which are useful to produce narrow beams with low side lobes. The proposed distributions are mainly raised versions of distributions obtained using Taylor's (1995) method.","PeriodicalId":148043,"journal":{"name":"Proceedings of the International Conference on Electromagnetic Interference and Compatibility (IEEE Cat. No.02TH8620)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115367415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electromagnetic pollution-the causes and concerns","authors":"N. Delhi., J. Behari","doi":"10.1109/ICEMIC.2002.1006546","DOIUrl":"https://doi.org/10.1109/ICEMIC.2002.1006546","url":null,"abstract":"Electromagnetic pollution, caused by increasing human activity, in the area of utilization of electrical and electromagnetic energy, is slowly increasing without much appreciation of the consequential implications. While everyone is aware of the benefits derived from the high-tech electrical and electronic devices and systems, only few users are aware of the real or unsuspected dangers from them. In this paper, it was intended to give a snap shot overview of this newer version of pollution by citing few examples.","PeriodicalId":148043,"journal":{"name":"Proceedings of the International Conference on Electromagnetic Interference and Compatibility (IEEE Cat. No.02TH8620)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131082524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spread spectrum clock-an EMC solution for new generation portable computers","authors":"N.J. Heredia","doi":"10.1109/ICEMIC.2002.1006478","DOIUrl":"https://doi.org/10.1109/ICEMIC.2002.1006478","url":null,"abstract":"Electronic equipment often generates radiated electromagnetic interference (EMI) that affects the operation of other electronic equipment. As more electronic systems operate at higher frequencies and bandwidths, more EMI gets generated. In a portable PC, the data bus and the clock are major EMI sources because they conduct high currents and form large loops. Due to lack of shielding, portable computer systems have come under increasing pressure to comply with strict EMI emission regulations, such as FCC and CISPR. Traditional techniques to reduce EMI attempt to contain or to reduce the amount of generated radiation. Coaxial wires and shielded cables are effective at containing radiation, but are expensive, bulky, and inflexible. Metal chassis with sealed seams are effective for reducing EMI of desktop PCs, but portable PCs are kept light by using plastics. Toxic metal paints are sometimes sprayed on plastic housings for portable PCs to provide shielding. A newer technique to reduce EMI is to vary or modulate the clock frequency in the PC. This technique is known as spread spectrum clock, since the frequency spectrum of the clock is spread over a wider range of frequencies. The paper focuses on this method to reduce the peak EMI emissions of the clock and data signals for EM compatibility.","PeriodicalId":148043,"journal":{"name":"Proceedings of the International Conference on Electromagnetic Interference and Compatibility (IEEE Cat. No.02TH8620)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131151455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Minimising EMI problems with chaos","authors":"S. Banerjee, D. Kastha, S. Sengupta","doi":"10.1109/ICEMIC.2002.1006481","DOIUrl":"https://doi.org/10.1109/ICEMIC.2002.1006481","url":null,"abstract":"All power electronic circuits with state feedback controlled switching can be described as nonlinear time-varying dynamical systems, and the occurrence of chaos-where the ripples become aperiodic-is common in such systems. It is shown here that this natural phenomenon can be effectively used in minimising EMI problems in power electronic circuits, because controllers based on chaos spreads the spectrum of power converters, thereby reducing the interference power at any target frequency.","PeriodicalId":148043,"journal":{"name":"Proceedings of the International Conference on Electromagnetic Interference and Compatibility (IEEE Cat. No.02TH8620)","volume":"201 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133674573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Propagation characteristics of ELF E-waves in sea water","authors":"G. Raju, G. Roy, V. P. Rao, K. Padma Raju, K. Chandra Bhushana Rao","doi":"10.1109/ICEMIC.2002.1006538","DOIUrl":"https://doi.org/10.1109/ICEMIC.2002.1006538","url":null,"abstract":"The propagation characteristic of very low frequency waves in sea water are presented to facilitate the design of appropriate sensors in order to find out the presence of such fields the data on intrinsic impedance of sea water is also presented.","PeriodicalId":148043,"journal":{"name":"Proceedings of the International Conference on Electromagnetic Interference and Compatibility (IEEE Cat. No.02TH8620)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116744167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Grounding for telecommunication equipment & systems","authors":"P. K. Bhat","doi":"10.1109/ICEMIC.2002.1006517","DOIUrl":"https://doi.org/10.1109/ICEMIC.2002.1006517","url":null,"abstract":"Telecommunication equipment and systems play a major role both during war and peace time. The technological growth in the field of telecommunication can create problems in the other devices or in the overall system. A grounding system ought to be designed using EMC guidelines so as to assure the reliable operation of the whole telecommunication systems and equipment. This paper makes an attempt in analyzing the various grounding problems encountered and remedies to be carried out for achieving the satisfactory performance of the telecommunication equipment and systems. The technology available in the country can be a barometer to assess the infrastructure available within the country in the field of communication systems and equipment. This paper makes an attempt in analyzing the various grounding problems encountered and remedies to be carried out for achieving the satisfactory performance of the telecommunication equipment and systems.","PeriodicalId":148043,"journal":{"name":"Proceedings of the International Conference on Electromagnetic Interference and Compatibility (IEEE Cat. No.02TH8620)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124625357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shielding considerations of 25 kW RF power source for FAF CO/sub 2/ laser","authors":"M. S. Bhagat, P. Choudhary, T. Reghu, A. Nath","doi":"10.1109/ICEMIC.2002.1006457","DOIUrl":"https://doi.org/10.1109/ICEMIC.2002.1006457","url":null,"abstract":"A 25 kW RF power source operating at 13.56 MHz to excite RF discharge in fast axial flow (FAF) CO/sub 2/ laser was developed. The power source is part of the laser system that is being operated in an industrial environment and is used for industrial applications. The various sources of EMI and their coupling paths of this power source are investigated and control/suppression measures for EMI are discussed.","PeriodicalId":148043,"journal":{"name":"Proceedings of the International Conference on Electromagnetic Interference and Compatibility (IEEE Cat. No.02TH8620)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121643962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling of planar spiral antenna mounted on a rocket shaped structure using wedge diffraction analysis","authors":"B. Rama Krishna Rao, N.S. Murthy Sarma, A. D. Sarma, K. Ravindra","doi":"10.1109/ICEMIC.2002.1006539","DOIUrl":"https://doi.org/10.1109/ICEMIC.2002.1006539","url":null,"abstract":"The location of the antenna on an aircraft plays a major role in improving the system performance. It is essential to locate the antennas in such a way that their radiation characteristics will be least distorted even under the influence of surroundings and EMI/EMC problems due to other electronic systems already installed on the aircraft. To predict the distortion in the radiation pattern of a planar cavity backed spiral antenna on board airborne platform, a novel technique is used using wedge diffraction theory. The experimental measurements are carried out in an anechoic chamber. The results predicted in the elevation plane is compared with experimental results and found to agree well.","PeriodicalId":148043,"journal":{"name":"Proceedings of the International Conference on Electromagnetic Interference and Compatibility (IEEE Cat. No.02TH8620)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127904486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DNA integrity invitro study of human peripheral blood leukocytes exposed to extremely-low-frequency electromagnetic fields using comet assay","authors":"R. Tiwari, K. Goud, K. Suryanarayana, S. Bhargava, Y. Ahuja","doi":"10.1109/ICEMIC.2002.1006545","DOIUrl":"https://doi.org/10.1109/ICEMIC.2002.1006545","url":null,"abstract":"Exposure to extremely-low-frequency (ELF) electromagnetic fields (EMFs) of various intensities is ubiquitous in both domestic and occupational environments. There is a concern over the possibilities that exposure to EMFs might affect the process of carcinogenesis. Controversial information is available on the effect of EMFs on DNA integrity. Hence, the present study was carried out to investigate the invitro effects of ELF-EMFs of varying flux densities (0.2, 0.4, 0.6, 0.8 and 1 mT at 50 Hz) on DNA integrity in human peripheral blood leukocytes using comet assay. All exposures were given at 37/spl deg/C (i.e., human body temperature). The experimental setup to produce the EMF consisted of an assembly of a dimmerstat, transformer, ammeter and air-cored coils to provide the desired field intensity at the seat of the blood samples. One set of coils was shielded against external, stray electromagnetic fields by housing the set of coils in a mu-metal (extremely-high-relative permeability magnetic material) box. Four types of exposures were studied simultaneously: (1) EMF exposure, samples shielded inside mu-metal box, placed in an incubator; (2) EMF exposure, samples not shielded, arranged inside the same incubator; (3) no EMF exposure, samples not shielded, but placed in dummy coils inside another incubator, and (4) no EMF exposure, no shielding, no dummy coils, but samples placed in a thermos containing water maintained at 37/spl deg/C. In addition, one set of samples was processed immediately after collection without any treatment. Heparin zed peripheral blood samples were collected from 6 adult males in the age group of 20-24 years. The subjects were non-smokers and non-drinkers of alcohol. Their leukocytes were processed by comet assay in the above mentioned treatments and controls. 100 cells per treatment were scored for comet tail-length which is an estimate of DNA damage. DNA damage increased with exposure dose. The results are similar to our earlier studies. Moreover, DNA damage had the following trend according to the types of exposures mentioned above: non-shielded exposed inside incubator>shielded exposed inside incubator>non-shielded non-exposed inside incubator>non-shielded non-exposed inside thermos>control.","PeriodicalId":148043,"journal":{"name":"Proceedings of the International Conference on Electromagnetic Interference and Compatibility (IEEE Cat. No.02TH8620)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125832686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theoretical BER evaluation for slow FH/NBFM systems in non-Gaussian-noise environment","authors":"T. K. Chauhan, A. K. Jain, M. Desanna, T.R. Rmamohan, T.N. Pranesha","doi":"10.1109/ICEMIC.2002.1006483","DOIUrl":"https://doi.org/10.1109/ICEMIC.2002.1006483","url":null,"abstract":"Conventionally frequency hopping spread spectrum systems are used in army tactical communication, where the noise environment is assumed to be Gaussian. Nowadays the system has its applications in commercial world also. The electromagnetic environment encountered by receiver systems in deployment conditions is often non-Gaussian in nature, owing to collocated EM systems comprising of own and enemy EM assets competing for the spectral resources resulting in co-channel, adjacent channel, wide as well as narrow band EMI situations of complex dynamics. The signal detectors designed for Gaussian statistics may suffer significant degradation when the actual statistics deviate from the Gaussian model. Both man-made and low frequency atmospheric interference environments are basically impulsive-noise, i.e. they have a highly structured form, characterized by significant probabilities of large interference levels. Under such environments the performance of the receiver systems, designed to perform optimally in Gaussian-noise, degrades significantly. The paper evaluates the performance of slow FH/NBFM communication systems in the presence of non-Gaussian noise. Theoretical calculation of BER is given for both, L-D detector and differential detector. The approach taken here is based on modeling the non-Gaussian noise as a two-component mixture of Gaussian distributions.","PeriodicalId":148043,"journal":{"name":"Proceedings of the International Conference on Electromagnetic Interference and Compatibility (IEEE Cat. No.02TH8620)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121140892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}